A source tells JustJared.com six people had to be carried out after fainting when Brit walked onto the stage!

“I had such an amazing time hanging with Nicki and all the boys … Nicki is such a star and is so sweet and you could feel the heat and the energy from the crowd the minute we walked in. I think this summers tour with Nicki is going to be my best ever. I cant wait!” Britney said.

15+ pictures inside of Britney Spears and Nicki Minaj at an after party…